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JWJ > Volume 37(5); 2019 > Article
Journal of Welding and Joining 2019 October;37(5) :448-454.
Published online October 15, 2019.
doi:https://doi.org/10.5781/JWJ.2019.37.5.3
Effect of Plasma Ion Nitriding Temperature on the Durability of SCM440 Steel
Sang-Ok Chong1  , Il-Cho Park2  , Cheon Ho Lee3  , Seong-Jong KIm4 
1Division of Maritime, DNV GL, Busan, 46971, Korea
2LINC+, Mokpo National Maritime University, Mokpo, 58628, Korea
3Digital Electric Generation of Industry, Inc., Yeongam, 58451, Korea
4Division of Marine Engineering, Mokpo National Maritime University, Mokpo, 58628, Korea
Correspondence: Seong-Jong KIm  Email: ksj@mmu.ac.kr
Received August 9, 2019  Revised September 24, 2019  Accepted September 27, 2019  Published online October 15, 2019
ABSTRACT
In this study, plasma ion nitriding technology was applied to investigate the effect of plasma ion nitriding temperature and the surface roughness of SCM440 steel on the durability of SCM440 steel for gear material. The mechanical properties of the plasma ion nitrided specimens were examined using a comprehensive analysis of nitriding depth, phase change, microstructure and micro-Vickers hardness values. As a result, the durability of SCM440 steel was found to be more significantly affected by plasma ion nitriding temperature than surface roughness. As the plasma ion nitriding temperature increased, the composite phase of brittle γ'-Fe4N + ε-Fe2-3N was converted into a single phase of γ'-Fe4N, and the depth of the nitride layer increased, making it suitable for gear materials.
Keywords: Plasma ion nitriding | SCM440 steel | Durability | Gear
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